That's a good point, check under wireless and networks and make sure "use only 2G networks" is not ticked.

If you type in *#*#4636#*#* into the dialler and select phone information, there should be an option to select preferred network type from a drop down list. Make sure it's set to WCDMA only or WCDMA preferred.

Progress, come up with Telecom NZ network in that *#*#4636#*#* network diagnostics. 35810040174343 / 02 imei. still emergency calls. Any way to receive the message and calls through the mobile data entry ?

I know it shouldn't be done, but can you make a emergency call. also have you spoken to telecom to see if they can see the device trying to authenticate etc. they should be able to see the device trying to access and should see why it fails.

Anything I suggest or say is my own thoughts and not provided by anyone else unless stated